Why, dont you add a feature, whereby you can SELECT which opponents you want to play. Some kind of invite feature, which means that you can play specific opponents if you choose.
Of course, leave the random feature in there, because it is good, but it shouldnt be the only option.

I belive that this request is out of place. people can open their private chat room by pressing /j name. when they press join simultaneouly they would play anyways. as judd says this would lead to groupbuilding and might increase the propensity of cheat trades in multiplayer modus. good idea but impossible to implement i am afraid

people can open their private chat room by pressing /j name. when they press join simultaneouly they would play anyways.

When you go into private chatrooms and select join, it still issues you a game based on everyone on the site, not just the people in the private room. That was the first avenue i explored, but not even that allows you to set up a game.

Its not about cheating other people, its about being able to play a game with certain friends. Who cares if people decide they want to cheat? It is easy to identify these people and get rid of them.